<template>
  <div class="app-container">
    <el-input v-model="filterText" placeholder="Filter keyword" style="margin-bottom:30px;" />

    <el-tree ref="tree2" :data="data2" :props="defaultProps" :filter-node-method="filterNode" class="filter-tree"
      default-expand-all />

  </div>
</template>

<script>
  import subject from '@/api/subject'

  export default {

    data() {
      return {
        filterText: '',
        data2: [],
        defaultProps: {
          children: 'children',
          label: 'title'
        }
      }
    },
    created() {
      this.getAllSubjectInfo();
    },
    watch: {
      filterText(val) {
        this.$refs.tree2.filter(val)
      }
    },

    methods: {
      getAllSubjectInfo() {
        subject.getAllSubject()
          .then(res => {
            console.log(res.data.allSubjectList);
            this.data2 = res.data.allSubjectList;
          })
      },
      filterNode(value, data) {
        if (!value) return true
        return data.title.indexOf(value) !== -1
      }
    }
  }
</script>